Feature/send validation emails

Send out notification emails for all tasks that have failed in the last hour. Add running this task at an hourly schedule

gso/services/mailer.py

@@ -7,19 +7,18 @@ from ssl import create_default_context
 from gso.settings import load_oss_params
 
 
-def send_mail(recipients: str, subject: str, body: str) -> None:
+def send_mail(subject: str, body: str) -> None:
     """Send an email message to the given addresses.
 
     Only supports STARTTLS, not SSL.
 
-    :param str recipients: The destination addresses, comma separated.
     :param str subject: The email subject.
     :param str body: The contents of the email message.
     """
     email_params = load_oss_params().EMAIL
     msg = EmailMessage()
     msg["From"] = email_params.from_address
-    msg["To"] = recipients
+    msg["To"] = email_params.notification_email_destinations
     msg["Subject"] = subject
     msg.set_content(body)